Fraud-preventing telephone system



Jan. 29, 1935. R H. I EsolNE FRAUD PREVENTING TELEPHONE SYSTEM Filed April 2e, 195s 30v 3l E 6 VNV a 4 I s m 4 v \9,% u r... z 19 z.4 43 1 6 M 4a. d .a L 4 y 1 8 0/ I NV EN TOR.

Hausse/ 66o n e.

A TTORNE Y.

Patented Jan. 2.9, 1935 'Ihis inventionvv relatessto- -atelephone L systerng andim'oreV p'ar-ticulrfrr-ly-il to?A a-y telephone system whereinfit-Jis necessaryitofdeposit alcoiribefore faz desirediconnectionznav be-flly iestablished.v3 53:. In systems of this character, it is customary-to provide-'the substation of falsubscribers 4line\7vithv a Acoin?:box-land #to F*effect lthe yv'estalolishirlent ofi-a -r desired connection-by the depositof a coinfin the# coin vShox; i THe-fcoin' boxlisl-'ordinarily provided 10# With a magnet for causing the refndir'igsorh'coh lecftioni cfs the-coin and-With contaetmeans operated by Jthe'ideposit of-thecoinn connectingihe magnetifrom one conductorof-thelinetoground Various` formsl ofmechariicaldevices?havej 'beenf l 154f`1devisedfin a-mannerwtmbertrippede by thefcoinv` I nwsysterns now in useyit has benltlre'practicee frequentlyonunscrupuloussubscribers to beat` the =coinfbox and avoid."- payment by 'simulatingvthefdeposit oa coin bymerely'V establishing?, con- 2mneetion ina manner toground one'sideoi?'thelli'nelv independently of the ceinfbox l Themai-nobject 'of myV-inventioniis -toj provide aJ systemhwherein-ii? is impossible' to -estahl-isha 11e-*f sired-connetion.exceptbyaetual deposit'of'a-'coiifii 2fin the box. Y i

Another'object islto simplify theeoin lactuating mechanisms" Whichlhavehereto'fdrebeenemployed inprepayment systemsf- Anotherl -obj ectis tovl provide La system wherein y 30?the--central-chisel-switching devices-are -enti'rely free-iromitheflineJ until #put `r`intothe -line f circuit` uporrop'er-ation offav relay 'responsive' tothe-deposit of acoina@ f y Y- Anotherl volojectiis l@to provide fasystemfWherei-'n' 351 'ianv auxiliary circuitr iskemployed'to permitl operaiv tion of-the call'4 bellv therethroughas `Welll as the use'othiscircuitfor anormal talking circuit.

Other objects will lbecome apparen-t" iroml'j astdy of #the detailed descriptionl which -follows 4li-Whenconsidered with` the laccompanyingf-draizving; wherein A Figure L1 isa -view yshowing circuitconneetions@V prior -tofde'positofa coin; and# Y 1 Fig-. 2 iis-a VieW L showing;v circuit connections@ Mzhsebnupby deposit: of fa=coinl`as -Welll as. aI ringingA d andfauxiliary talking circuit.V Referring-tof the drawing `in detail, the Well knowrr-suloscribersl station 'comprises Y thetrans-r mittei'-1,1receiver 2;y primary 3,5 secondary 4,1 calliI 5fbeil' sfandcondenser 6:: The mai-awning circuiti includes conductors L'7 'andi-8 and.` theiassocia'tecl protector 9." Infaccordance lwith-mylimprovedi system, *the station1 Tshown `is `provided@Wi-thisup- A plemental f 'equipmentiwhich'comprises :relays 10 'l 55?* andfzll lanche transformer/1 device 12.1' -1 'Ihefrcon-' 'relay11lisoleenergized..1 Closingnflcontact 24fqper mits'flalternating' current to2ipass:.1from= .linef erateddnrthissecondary ywill passover conducto the' A? C."circuit1throu`gli dine 7i f and :to co'rm'ectff4 the-mai l ir'ectl current talkin with an armature 37, and a batteryf The-rter- 'i F'thisidirci-'1itleadfito"" clearing kor tnescentrai; station:whichrisxcpera'teds when bot subscriber-sLhangfuprafter a'calharidi in-arnannerto-openifthiszholingccircib..... ,452i Ordinarily; 'When-f nii-call hasq'emanatedvfronn thelsubseribers'stationgf the niairitalkirigfcircuiti is--fopeii t-'-armatureszOgoSlfiandil haim'evprovidedr ani? anxiliarwringing'l andrtallsing'circuit tarbes used 'when i a call" isitransmittedrfrom'fthexicentnalo 50i statioriaj -Afimultiplebarmature S'relayf 39iisev11s'e1fs to control this ringing circuit. fRinging@mirrer'itzl.l

-' 'fromconductortthroughiline Deconl@ coil". 42; normallyj'closeocontact :44 and Joaclceto=cont1uetori-32r5c .Thisxcurax 551,

armature rent will energize relay 39 to pull in armatures 45 and 46 to connect conductors 32 and 33 to main conductors 7, 8. A holding circuit for relay 39 is made by an armature 49, through its contact 50, holding coil 51, conductor 52 and battery 53. The terminals 52 of this holding circuit lead to a clearing or like relay in the central station in a manner to open this circuit when subscribers hang up after a call. An armature 54 is provided to be pulled in by .energization of relay 39 tobreak the circuit toconductor 7 to remove A. C. energization therefrom.

In operation, the subscriber must rst remove his receiver to initiate his call, after which he will deposit a required coin whichis shown in Fig. 2 as shunting the contacts 17, 18. .Alternating current will then pass from line 7, through the primary 3, receiver hook, transmitter 1, line 13, and coil of relay 11. This will cause armatures 20 and 23 to pull in. The ringing circuit will be broken at contact 21. The primary 25 will be energized from line 13 through the armature 23 andcontact 24. The transformer 12 is so wound that 50 volts on'its primary will generate 'about 150 volts inthe secondary 27. The relay 29 is designed tooperate on about 150 volts but not at 50 volts the normal line current. Operation of relay 29 is effective to pull in armatures 30, 31 to connect conductors 32, 33 to main conductors 7, 8 and, simultaneously, the A. C. supply to line 7 is broken at contact 35. At this instant, the subscriber will Vreceive the dial tone and may proceed with his call. When armatures 30, 31 are pulled up, the usual direct current and voltage is impressed on lines 7, 8 and direct current will pass through coil of relay 10, pull in its armature y16 and connect lines 7 and 13 to return line 8, and this operation will aiord a direct current supply to the circuit of transmitter V1. When central puts through a call, ringing current is impressed on conductors 32,- 33 and relay coil 42 to pull in its armatures 45,46, which, in turn, will connect conductors 3233 to lines 7, 8 and permit operation of call bell 5.

be obvious from this disclosure that no opportunity nor means are offered that would permit a subscriber to make connection for a call in any manner except by deposit of aV required coin. WhatI claim is- 1. In a telephone system, the-combination of a central station, a substation,a line connecting the central stationand substation, and a coincontrolled deviceat the substation,'a line switching device comprising a relay at said central station, a return circuit ybetween said stations and in series with a winding of said; relay, and means at said substation operably responsive to deposit of a coin for impressing alternating current on` said return circuit andvvinding to operate said switching devices. 1.

2. In a telephone: system, the combination of a o central station, a substation, a line 4connecting "the central station and substation, and acoin `con- It will be noted that-the 50 volt circuit closed trolled device at the substation, a step-up transformer at said substation comprising primary and secondary coils, means at said substation responsive to deposit of a coin for passing alternating current from said line through the transformer primary, a line switching device comprising a relay at said central station, and a return circuit in series with the transformer secondary and a Winding of said relay.

3. In a telephone system, the combination of a central station, a substation, a line connecting the central station and substation, and a coin controlled device at the substation, a line switching vdevice comprising a relay at said central station, a return circuit between said stations and in series withl a winding of said relay, means at said substation responsive to deposit of a coin for impressing alternating current on said return circuit-and winding, and means operably respon- Ysive to operation of said relay for connecting said line` to said line switching devices.

4 In d a device as set forth in claim 1, means operably responsive to operation of said relay for cutting olic the supply of alternating current to said line.

5. In a device as set forth in claim 1, a holding circuit for said relay, and means responsive to energization of the relay for energizing the hold- Aing circuit to maintain said switching devices in operative-position.

6. In a telephone system, the combination of a central station, a substation, aline connecting said stations and connected to an alternating current supply, a coin controlled device at `the substation, a relay at the substation and operable in response to the deposit of a coin, an alternating voltage on said line, a return circuit between said stations, an inductive coupling between said line and return circuit, means to energize said coupling upon operation of said relay,

a relay at said central station in series with said return circuit, a y,distributing frame, and means for connecting said line and return circuit to said frame upon operation of said Alast named relay.

7.In a telephone system, the combination of a central station, a substation, a line connecting said stations, and a coin controlled device at the -substation, means for impressing an alternating voltage on said line, a line switching device comprising a relay at said central station, said relay being responsive only to. voltages 4higher thanv sof-1 the voltage impressed on said line, a returnr circuit, means at said substation responsive to deposit of a coin for stepping up the alternating voltage and impressing the increased voltage on said return circuit, 1said circuit being connectedin series with a winding of said relay.

8. In a telephone system, the combination of i a central station, a substation, a line connecting said stations, and a coin controlled device at.

the substation, means for impressing an alternating voltage on said line, line switching devices comprising a relay at said central station, a return circuit between, said stations and in series with a winding of the'relay, means at the substation responsive to deposit of a coin for energizing said relay to connect the line-and circuit to said switching devices, and a ringing circuit at said central station for impressing ringing current on said line and circuit while said relay4 is linoperative to connect said switching devices.- 1 9. In a system as set forth in claim 8, a ringz ing relay, said ringing circuit being open to said g line and'circuit at.v said ringing relay, said ringing `ntiserszi relay being operably responsive to ringing current to connect the ringing circuit to the line and return circuit.

10. In a system as set forth in claim 8, a ringing relay having an exciting coil, an auxiliary circuit in shunt With the ringing circuit, said auxiliary circuit including said coil and a condenser, the ringing current being eiective to operate the ringing relay, and means for connecting the ringing circuit to said line and return circuit upon operation of the ringing relay.

11. In a system as set forth in claim 8, a ringing relay, said ringing circuit being open to the line and return circuit at said ringing relay, said ringing relay being operably responsive to ringing current to connect the ringing circuit to the line and return circuit, and a holding circuit for said ringing relay for permitting talking currents to pass through said ringing circuit.

12. In a telephone system, a central station and a substation, line conductors forming a circuit between said stations', a relay at said central station and in series with one line conductor, means for impressing a low alternating Voltage across said lines, said relay being unresponsive to normal 10W voltage alternating current in said lines due to a short circuit between said lines, and means operably responsive to the deposit of a coin at the substation for increasing said voltage suiiiciently to permit operation of the relay.

13. In a system as set forth in claim 12, a ringing relay, an auxiliary ringing circuit, the latter circuit being normally open rat the ringing relay, said ringing reiay being operably responsive to ringing current to connect the ringing circuit to the line conductors, and means operably re- Cil sponsive to operation of the ringing relay for disconnecting the source of alternating voltage from the lines.

RUSSELL H. LESOINE. 

